sony xperia mini pro - Changing layout of hardware keyboard

How I can change a layout or add a new layout to physical keyboard of Xperia mini pro phone?

I want for example remap ? to ''ə'' and shift ? to ''Ə'', or س to ی in Persian layout or even add new layout (Persian 2 layout).

You can find build-in layout here, actually I want to add a new layout to them.